﻿/************************************************************************

   Extended WPF Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 

   This program can be provided to you by Xceed Software Inc. under a
   proprietary commercial license agreement for use in non-Open Source
   projects. The commercial version of Extended WPF Toolkit also includes
   priority technical support, commercial updates, and many additional 
   useful WPF controls if you license Xceed Business Suite for WPF.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Windows;
using System.Windows.Controls;

namespace Xceed.Wpf.Toolkit
{
  /// <summary>
  /// Base class for controls that represents controls that can spin.
  /// </summary>
  public abstract class Spinner : Control
  {
    #region Properties

    /// <summary>
    /// Identifies the ValidSpinDirection dependency property.
    /// </summary>
    public static readonly DependencyProperty ValidSpinDirectionProperty = DependencyProperty.Register( "ValidSpinDirection", typeof( ValidSpinDirections ), typeof( Spinner ), new PropertyMetadata( ValidSpinDirections.Increase | ValidSpinDirections.Decrease, OnValidSpinDirectionPropertyChanged ) );
    public ValidSpinDirections ValidSpinDirection
    {
      get
      {
        return ( ValidSpinDirections )GetValue( ValidSpinDirectionProperty );
      }
      set
      {
        SetValue( ValidSpinDirectionProperty, value );
      }
    }

    /// <summary>
    /// ValidSpinDirectionProperty property changed handler.
    /// </summary>
    /// <param name="d">ButtonSpinner that changed its ValidSpinDirection.</param>
    /// <param name="e">Event arguments.</param>
    private static void OnValidSpinDirectionPropertyChanged( DependencyObject d, DependencyPropertyChangedEventArgs e )
    {
      Spinner source = ( Spinner )d;
      ValidSpinDirections oldvalue = ( ValidSpinDirections )e.OldValue;
      ValidSpinDirections newvalue = ( ValidSpinDirections )e.NewValue;
      source.OnValidSpinDirectionChanged( oldvalue, newvalue );
    }

    #endregion //Properties

    /// <summary>
    /// Occurs when spinning is initiated by the end-user.
    /// </summary>
    public event EventHandler<SpinEventArgs> Spin;

    /// <summary>
    /// Initializes a new instance of the Spinner class.
    /// </summary>
    protected Spinner()
    {
    }

    /// <summary>
    /// Raises the OnSpin event when spinning is initiated by the end-user.
    /// </summary>
    /// <param name="e">Spin event args.</param>
    protected virtual void OnSpin( SpinEventArgs e )
    {
      ValidSpinDirections valid = e.Direction == SpinDirection.Increase ? ValidSpinDirections.Increase : ValidSpinDirections.Decrease;

      //Only raise the event if spin is allowed.
      if( ( ValidSpinDirection & valid ) == valid )
      {
        EventHandler<SpinEventArgs> handler = Spin;
        if( handler != null )
        {
          handler( this, e );
        }
      }
    }

    /// <summary>
    /// Called when valid spin direction changed.
    /// </summary>
    /// <param name="oldValue">The old value.</param>
    /// <param name="newValue">The new value.</param>
    protected virtual void OnValidSpinDirectionChanged( ValidSpinDirections oldValue, ValidSpinDirections newValue )
    {
    }
  }
}
